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Friday, 9 October

JEE Main Physics · Class 12

Nuclei: JEE Main previous year questions

Nuclei had 38 questions in the 42 JEE Main shifts Lumi analysed, about 0.8 a shift, asked in 31 of 42 shifts. It ranks 17 of 29 Physics chapters by questions; 3% of its questions were hard.

Questions
38
in 31 of 42 shifts
A shift, on average
0.8
of 25 Physics questions
Since 2024
-0.1
0.9 a shift in 2017–23, 0.8 in 2024–26
Numerical answer
6
16% of its questions

Year by year

How often it came

Questions in the analysed shifts of each year. Years differ in how many shifts Lumi analysed, so read the bars with the shift count.

Questions each year
05101’172’208’214’223’239’245’256’26

2017: 1 shifts · 2020: 4 shifts · 2021: 4 shifts · 2022: 4 shifts · 2023: 4 shifts · 2024: 8 shifts · 2025: 8 shifts · 2026: 9 shifts

Difficulty by year
  • 20171
  • 20202
  • 20218
  • 20224
  • 20233
  • 20249
  • 20255
  • 20266
  • Easy
  • Medium
  • Hard

Inside the chapter

Topics and the ideas that repeat

3 topics and 24 distinct ideas; 7 ideas were asked more than once. Most questions are single correct and calculation.

Topics, by questions
Ideas asked most
7 repeat

Study it on Lumi

Nuclei: the interactive lesson

Every question

All 38 Nuclei questions

Newest first. Each opens with its options and the official answer.

2026 6 questions

  1. 2 Apr 2026, Shift 2 · Q44The binding energy per nucleon of 20983Bi\frac{209}{83}Bi isMediumSingle correct
  2. 4 Apr 2026, Shift 1 · Q29Two nuclei of mass number 33 combine with another nucleus of mass number 44 to yield a nucleus of mass number 1010. If the binding…MediumSingle correct
  3. 5 Apr 2026, Shift 2 · Q44Assuming the experimental mass of 612C{}^{12}_{6}\mathrm{C} as 12 u, the mass defect of 612C{}^{12}_{6}\mathrm{C} atom is ________…EasySingle correct
  4. 6 Apr 2026, Shift 1 · Q48The energy released when 717.13\frac{7}{17.13} kg of 37Li^{7}_{3}\mathrm{Li} is converted into 24He^{4}_{2}\mathrm{He} by proton bombardment is…MediumNumerical value
  5. 6 Apr 2026, Shift 2 · Q41The energy released if hydrogen atoms are combined to form 24He^{4}_{2}\mathrm{He} is __________ MeV. (Take binding energies per nucleon of…EasySingle correct
  6. 8 Apr 2026, Shift 2 · Q44Two radioactive substances A and B of mass numbers 200 and 212 respectively, shows spontaneous α\alpha-decay with same QQ value of 1…MediumSingle correct

2025 5 questions

  1. 2 Apr 2025, Shift 2 · Q38Energy released when two deuterons (1H2_1\mathrm{H}^2) fuse to form a helium nucleus (2He4_2\mathrm{He}^4) is : (Given : Binding energy per…EasySingle correct
  2. 3 Apr 2025, Shift 1 · Q44Match the LIST-I with LIST-II LIST-I A.…MediumMatch the list
  3. 4 Apr 2025, Shift 2 · Q42A radioactive material P first decays into Q and then Q decays to non-radioactive material R. Which of the following figure represents…MediumDiagram basedHas a figure
  4. 7 Apr 2025, Shift 2 · Q44Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : The density of…EasyAssertion–reason
  5. 8 Apr 2025, Shift 2 · Q44For a nucleus of mass number A and radius R, the mass density of nucleus can be represented asEasySingle correct

2024 9 questions

  1. 8 Apr 2024, Shift 1 · Q46Binding energy of a certain nucleus is 18×10818\times10^8 J. How much is the difference between total mass of all the nucleons and nuclear…EasySingle correct
  2. 9 Apr 2024, Shift 1 · Q47The energy equivalent of 11 g of substance is :EasySingle correct
  3. 9 Apr 2024, Shift 1 · Q60A star has 100%100\% helium composition. It starts to convert three 4He{}^4\mathrm{He} into one 12C{}^{12}\mathrm{C} via triple alpha process…HardNumerical value
  4. 9 Apr 2024, Shift 2 · Q37The energy released in the fusion of 2 kg2\ kg of hydrogen deep in the sun is EHE_H and the energy released in the fission of 2 kg2\ kg of…MediumSingle correct
  5. 29 Jan 2024, Shift 1 · Q47The explosive in a Hydrogen bomb is a mixture of 1H2{}_1\mathrm{H}^2, 1H3{}_1\mathrm{H}^3 and 3Li6{}_3\mathrm{Li}^6 in some condensed form.…MediumSingle correct
  6. 30 Jan 2024, Shift 2 · Q47In a nuclear fission reaction of an isotope of mass MM, three similar daughter nuclei of same mass are formed. The speed of a daughter…MediumSingle correct
  7. 31 Jan 2024, Shift 1 · Q60The mass defect in a particular reaction is 0.4g. The amount of energy liberated is n×107n\times10^7 kWh, where n=n= _______. (speed of light…EasyNumerical value
  8. 31 Jan 2024, Shift 2 · Q47The mass number of nucleus having radius equal to half of the radius of nucleus with mass number 192 is:EasySingle correct
  9. 31 Jan 2024, Shift 2 · Q60A nucleus has mass number A1A_1 and volume V1V_1. Another nucleus has mass number A2A_2 and Volume V2V_2. If relation between mass number…EasyNumerical value

2023 3 questions

  1. 8 Apr 2023, Shift 2 · Q44A radio active material is reduced to 1/8 of its original amount in 3 days. If 8×10−38\times10^{-3} kg of the material is left after 5 days…MediumSingle correct
  2. 11 Apr 2023, Shift 1 · Q33Two radioactive elements A and B initially have same number of atoms. The half life of A is same as the average life of B. If λA\lambda_A…EasySingle correct
  3. 13 Apr 2023, Shift 2 · Q48Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A : The binding energy per…MediumAssertion–reason

2022 4 questions

  1. 28 Jul 2022, Shift 1 · Q48The half life period of a radioactive substance is 60 days. The time taken for 78\frac{7}{8}th of its original mass to disintegrate will…EasySingle correct
  2. 28 Jul 2022, Shift 1 · Q52A freshly prepared radioactive source of half life 2 hours 30 minutes emits radiation which is 64 times the permissible safe level. The…EasyNumerical value
  3. 24 Jun 2022, Shift 1 · Q45Nucleus A is having mass number 220 and its binding energy per nucleon is 5.6 MeV. It splits in two fragments 'B' and 'C' of mass numbers…EasySingle correct
  4. 29 Jun 2022, Shift 1 · Q33The activity of a radioactive material is 2.56×10−32.56 \times 10^{-3} Ci. If the half life of the material is 5 days, after how many days the…EasySingle correct

2021 8 questions

  1. 3 Aug 2021, Shift 2 · Q12If AA, ZZ and MM represents the number of nucleons, protons and mass of the nucleus respectively, then mass defect ΔM\Delta M is…EasySingle correct
  2. 3 Aug 2021, Shift 2 · Q18A radioactive isotope has a half life of T years. After how much time is its activity reduced to 6.25% of its original activity ?EasySingle correct
  3. 3 Aug 2021, Shift 2 · Q25A sample undergoing beta decay, reduced to 116th\frac{1}{16}^{\mathrm{th}} of its initial mass in 48 years. Its half life period is…EasyNumerical value
  4. 25 Jul 2021, Shift 1 · Q1The half-life of 198Au^{198}\mathrm{Au} is 3 days. If atomic weight of 198Au^{198}\mathrm{Au} is 198 g/mol then the activity of 2 mg of…MediumSingle correct
  5. 25 Jul 2021, Shift 1 · Q5Some nuclei of a radioactive material are undergoing radioactive decay. The time gap between the instances when a quarter of the nuclei…MediumSingle correct
  6. 16 Mar 2021, Shift 2 · Q10Calculate the time interval between 33% decay and 67% decay if half-life of a substance is 20 minutes.EasySingle correct
  7. 16 Mar 2021, Shift 2 · Q12The half-life of Au198\mathrm{Au^{198}} is 2.7 days. The activity of 1.50 mg of Au198\mathrm{Au^{198}} if its atomic weight is 198 g…MediumSingle correct
  8. 18 Mar 2021, Shift 1 · Q11A radioactive sample disintegrates via two independent decay processes having half lives T1/2(1)T_{1/2}^{(1)} and T1/2(2)T_{1/2}^{(2)} respectively.…MediumSingle correct

2020 2 questions

  1. 2 Sep 2020, Shift 1 · Q18In a reactor, 2 kg of 92U235_{92}\mathrm{U}^{235} fuel is fully used up in 30 days. The energy released per fission is 200 MeV. Given that the…MediumSingle correct
  2. 6 Sep 2020, Shift 2 · Q18Given the masses of various atomic particles mp=1.0072m_p=1.0072 u, mn=1.0087m_n=1.0087 u, me=0.000548m_e=0.000548 u, mνˉ=0m_{\bar\nu}=0, md=2.0141m_d=2.0141 u, where…MediumSingle correct

2017 1 questions

  1. 2 Apr 2017 (offline) · Q26A radioactive nucleus A with a half life T, decays into a nucleus B. At t=0t=0, there is no nucleus B. At sometime t, the ratio of the…MediumSingle correct

Pattern: Asked most years.